[TM4J-users] Bug in EventDispatchImpl (tmnav-0.2.9pre1-src) + question on trapping hypergraph TMO events

[Bret C. <bre...@ya...>]

Christoph,

If you remember our conversations of last November,
I've now created abstractors that result in the
hypergraphs creating the views of my data that I want!
I'm happy with the results(and so is my professor --
who now wants to apply for a grant to keep on as a
research assistent to explore new applications for the
topic map hypergraph!). Thanks so much for the help
you have provided me.

I am now trying to add another feature to trap the
event for when a user clicks on an activity (Topic)
node so that I can create a new hypergraph to show the
sub-activities
for this activity. 

I see that there is an event type EV_TMO_SELECTED, and
that the EventDispatcherImpl has a method,
sendTMOSelected(), for sending notification of such an
event. My question is:
HOW CAN I TRAP WHEN THE USER CLICKS ON THE TOPIC NODE,
SO THAT CAN THEN CALL THE ABOVE METHOD? Do I need to
trap a low-level mouse-click event, or does TMNav
provide for trapping such an event?

Also, I found and fixed (within my copy of the source
code) a bug in the tmnav-0.2.9pre1-src version of
EventDispatchImpl.
(I don't know if you have fixed the bug since then):

The dispatcher wasn't sending events to the registered
listeners. When I debugged, I noticed that the
dispatcher's send() method wasn't able to access the
changes to the listeners HashMap created when a new
listener was added. I fixed the problem (within my
copy of the code) by making the HashMap a static final
variable as follows:

//  private HashMap listeners = new HashMap();
  private static final HashMap listeners = new
HashMap();

I've also written a monograph that explains how I used
TM4J and TMNav to develop my application. I don't know
if it would be useful for other developers, or to
include parts within the TMNav documentation.

Bret Cohen


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